When the Marvel logo appears at the end of the closing credits, the sound of a hammer hitting metal can be heard several times (this is the sound of Tony Stark forging his suit in Iron Man (2008), setting in motion the Marvel Cinematic Universe).
The six main Avenger actors get their own special credit: each actor gets a montage of their characters in action, then they appear in profile with their signature, a style taken from the Star Trek (1966) finale Star Trek VI: The Undiscovered Country (1991).
The Marvel logo in the opening removes all the heroes who got erased in Avengers: Infinity War (2018).
"Make Way for Tomorrow Today", the Stark Expo song from Iron Man 2 (2010), is heard in the closing credits.